Update on Sunday April 15, before dawn:
Well, my calculations for hatch date were wrong. The peregrine eggs at the Cathedral of Learning didn’t hatch on April 13 or 14.
They didn’t even pip.
By the end of the day yesterday (April 14) no one could confirm the pip reported on the 13th.
I guess it was a false alarm. However, the eggs will hatch soon.
More news later.
(photo from the National Aviary falconcam at Univ. of Pittsburgh)